Traditional Culture Encyclopedia - The 24 Solar Terms - What is the function of valve train?
What is the function of valve train?
According to the understanding of xiaobian of automobile maintenance network, many friends do not know much about some automobile knowledge. In order to facilitate everyone to understand this knowledge, today, Xiaobian of Automobile Maintenance Network will introduce the composition of the valve train.
Interested friends can learn about this problem, which may be helpful to you.
The valve drive group consists of: valve matching gear, camshaft and parts, rocker shaft and parts, valve push rod, valve, cylinder head, valve seat, valve sleeve, valve spring, valve lock piece and parts, valve adjusting screw and other parts.
Valve mechanism is all parts from timing gear to valve response, and its composition varies with the form of valve mechanism. Its function is to drive the valve to open and close regularly. The key parts of the valve train include camshaft, timing gear, tappet and its guide rod, push rod, rocker arm and rocker shaft. Its function is to make the intake valve and exhaust valve open and close at the time specified in the valve distribution phase, and ensure sufficient opening.
1. Camshaft is a key component in the valve train, and its function is to adjust the opening and closing of the valve and the change law of its lift. Lower camshaft engine. It also relies on the camshaft to drive the gasoline pump, oil pump and distributor.
2. The tappet is used to transfer the driving force generated by camshaft rotation to the push rod (lower and middle camshaft) or the valve (overhead camshaft). Most tappets are made of alloy steel or alloy cast iron and have good wear resistance.
3. Push rod: There is a slender push rod in the valve mechanism of the lower camshaft. The function of push rod is to transfer the driving force of cam from tappet to rocker mechanism. The function of rocker arm is to change the direction of the force from the push rod or cam, and then transfer it to the valve to open it. The rocker arm assembly is mainly composed of rocker arm, rocker arm shaft, bearing seat, valve clearance adjustment screw and other parts. The rocker arm is a double-arm lever with the middle shaft hole as the fulcrum. One side of the short wedge is equipped with a valve clearance adjustment screw, and one end of the long arm has an arc working surface to push the valve. In order to improve its working life, the long arm arc working face needs quenching treatment.
(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)
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